For names ending in s, you can either add an apostrophe + s, or just an apostrophe. The first option is more common. When pronouncing a possessive name, we add the sound /z/ to the end of the name. 'Belonging to' or 'ownership' is the most common relationship the possessive expresses. John owns a car. = It is John's car. America has some gold reserves. = They are America's gold reserves. John goes to this school. = This is John's school. John sleeps in this room. = This is John's room. Mrs Brown's colleague will not be coming to the meeting. There are also some fixed expressions where the possessive form is used. The possessive is also used to refer to shops, restaurants, churches and colleges, using the name or job title of the owner. I've got an appointment at the dentist's at eleven o'clock.